Essential oils are wonderful mood-enhancers. I have many clients experiencing depression and anxiety from stress. While stress takes time to balance, the emotions involved can quite readily be helped with essential oils.
Usually the scents/blends I use for people are chosen specifically for them and then used in a massage. This way the system is programmed for relaxation from this specific blend. I have found this to be an effective way to “open the door” for further work with stress. An overloaded system and/or brain can not assimilate information…this is one of the reasons the downward-spiral of stress is so debilitating; handling stress comes from knowledge and conscious choices. You learn to handle stress, it doesn’t just happen.

When stressed or depressed we are very bad at helping ourselves. Even if we know how to do it, we don’t manage to do it. Everything is too much, and nothing feels very important anymore. The only thing we feel we can do is close our eyes and hope for it all to go away.

This is where the brilliance of essential oils come in: It is actually enough to open the bottle and inhale deeply from it to feel some release. When I say inhale, I mean inhale. Take a deep breath and bring the scent of the oil as deep into yourself as you can. Close your eyes while doing it, and feel what happens to you.
This is the simplest and most basic way of using an essential oil for mood-enhancement. You can also put a few (3-5) drops on a tissue or handkerchief and carry it around with you for use during the day. Since essential oils are volatile, you might need to refresh the oil after a few hours.

The choice of oil is individual. It is all about what you feel. Smell essential oils and see what they do to you. Remember that your system usually can handle only about 5 different oils at a time, then it is suffused. Go outside, breath some fresh air and then you can smell some more. This, of course, is highly individual.

Resinous oils are protective and warming:Frankincense(boswellia carterii) Uplifting, deepens breathing, meditation.Myrrh(commiphora myrrha) Warming and emotionally healing.Benzoin(styrax benzoin) Warming, euphoric, calming, protecting.Floral oils are calming uplifting and emotionally releasing:Geranium(pelargonium graveolens) Very balancing when there is also anger, frustration or irritation.Lavender(lavandula officinalis / augustifolia) Wonderfully calming when there are also sleeping-problems.Ylang-Ylang (cananga odorata) Uplifting, euphoric and very good where there is anger. (High doses can give head-ache and/or nausea)

Citrus oils are uplifting and refreshing. They also blend well with the above-mentioned oils. Citrus oils carry sun-energy and this can be helpful during the wintermonths.Orange(citrus sinensis) Sweet, uplifting.Lemon(citrus limon) Refreshing, clears the mindMandarin(citrus reticulata) Sweet, helps the inner child.

Another great oil when there is sluggishness, tiredness (physical & emotional):Rosemary(rosmarinus officinalis) Uplifting, clears the mind, stimulating.

Note: Essential oils are not drugs. They work with the body. If your system is exhausted and you need to sleep, even the most stimulating oil will not keep you alert.
Also note that if depression is severe it is good to bring in some stimulating oils (citrus, rosemary) since the more calming oils can enhance depression in higher doses.

QUALITY: Buy good quality oils. If the oil is of an inferior quality, you will not have the benefits. Essential oils are natural, they have life-energy. If they are handled and stored wrongly they will lose their properties. E.O are quite costly but they go a long way. Always look for the latin name on the label, this way you are sure that you get the real thing. (There are many different cedars, for example, and one of them is slightly toxic to the system.)
The label should also say 100% pure essential oil.

WARNING: Essential oils are highly concentrated and can be irritating to the skin and mucous membranes. Do not use them internally, do not use neat on skin, keep away from eyes, children and pets.